Composition for the protection of an article against corrosion

Abstract

This disclosure relates to a composition for the protection of an article against corrosion, wherein the composition comprises a blend comprising about 50 to about 99 wt. % of an amorphous polymer and about 1 to about 50 wt. % of a hydrocarbon wax, based on the total weight of the blend, the composition containing at least 30 wt. % of said blend, based on the total weight of the composition, wherein the amorphous polymer has a glass transition temperature T g of lower than about −20° C.; and the hydrocarbon wax has a melting point of about 35° to about 130° C. This disclosure also relates to a wrapping tape comprising a backing layer and a layer comprising the composition.

1 . A method of protecting an article against corrosion, the method comprising:
 utilizing a composition to protect the article, wherein the composition comprises a blend comprising:
 from about 70 to about 95 wt. % of an amorphous polymer and 
 from about 5 to about 30 wt. % of a hydrocarbon wax, based on the total weight of the blend, the composition containing at least 30 wt. % of said blend, based on the total weight of the composition, wherein: 
 (a) the amorphous polymer has a glass transition temperature T g  of lower than about −20° C.; and 
 (b) the hydrocarbon wax has a melting point of about 35° C. to about 130° C., wherein the wax is a microcrystalline wax or a paraffin wax. 
   
     
     
         2 . The method according to  claim 1 , wherein the amorphous polymer is selected from the group consisting of:
 (a1) a polymer comprising from about 50.0% to about 98% by weight of isobutene and from about 2% to about 50.0% of a C 2 -C 12  alkene other than isobutene, a C 4 -C 12  alkadiene, or a mixture thereof, based on the total weight of the polymer;   (a2) a polymer comprising from more than about 98% to about 100% by weight of isobutene, based on the total weight of the polymer;   (a3) a polymer comprising from about 50.0% to about 99.9% by weight of propene and from about 0.1% to about 50.0% of a C 2 -C 12  alkene other than propene, a C 4 -C 12  alkadiene, or a mixture thereof, or about 100 wt. % propene, based on the total weight of the polymer;   (a4) a polymer comprising from about 0.1% to about 50.0% by weight of ethene and from about 50.0% to about 99.9% of a C 2 -C 12  alkene other than ethene, a C 4 -C 12  alkadiene, or a mixture thereof, based on the total weight of the polymer;   (a5) a polymer comprising from about 0.1% to about 50.0% by weight of 2-methyl-1-pentene and about 50.0% to about 99.9% of a C 2 -C 12  alkene other than 2-methyl-1-pentene, a C 4 -C 12  alkadiene, or a mixture thereof, or from about 100 wt. % 2-methyl-1-pentene, based on the total weight of the polymer; and   (a6) a mixture of (a1), (a2), (a3), (a4) and/or (a5).   
     
     
         3 . The method according to  claim 2 , wherein the amorphous polymer is selected from the group consisting of (a1) and (a2), and a mixture thereof. 
     
     
         4 . The method according to  claim 1 , wherein the amorphous polymer has a number average molecular weight M n  in the range of 1,000 to 150,000 g/mol. 
     
     
         5 . The method according to  claim 1 , wherein the composition contains from about 80 wt. % to about 99.9 wt. % of the blend and from about 0.1 wt. % to about 20 wt. % of an additive. 
     
     
         6 . The method according to  claim 1 , wherein the composition further comprises a filler material. 
     
     
         7 . The method according to  claim 6 , wherein the composition comprises from about 5 to about 70 wt. % of filler material and from about 30 to about 95 wt. % of the blend comprising the amorphous polymer and the hydrocarbon wax, based on the total weight of the composition. 
     
     
         8 . The method according to  claim 6 , wherein the composition comprises from about 5 to about 40 wt. % of filler material and from about 60 to about 95 wt. % of the blend comprising the amorphous polymer and the hydrocarbon wax, based on the total weight of the composition. 
     
     
         9 . The method according to  claim 6 , wherein the composition comprises from more than about 40 to about 60 wt. % of filler material and from about 40 to less than about 60 wt. % of the blend comprising the amorphous polymer and the hydrocarbon wax, based on the total weight of the composition. 
     
     
         10 . The method according to  claim 1 , wherein the composition further comprises an additive. 
     
     
         11 . The method according to  claim 10 , wherein the additive is selected from the group consisting of anti-oxidants, colorants, pigments and mixtures thereof. 
     
     
         12 . The method according to  claim 10 , wherein the additive is an anti-oxidant. 
     
     
         13 . The method according to  claim 12 , wherein the anti-oxidant is present in an amount of about 0.05 to about 5 wt. %, based on the total weight of the composition. 
     
     
         14 . The method according to  claim 12 , wherein the anti-oxidant is selected from the group consisting of primary anti-oxidants, secondary anti-oxidants, multifunctional anti-oxidants, lactones, and combinations of two or more of said anti-oxidants. 
     
     
         15 . Wrapping tape comprising:
 (a) a backing layer, and   (b) a layer comprising the composition of  claim 1 .   
     
     
         16 . Wrapping tape according to  claim 15 , wherein the wrapping tape has a total thickness of about 0.5 to about 20 mm. 
     
     
         17 . The method according to  claim 11 , wherein the additive is an antioxidant. 
     
     
         18 . The method according to  claim 5 , wherein the composition further comprises an additive.